diff --git a/src/clean-code/05-dry.ts b/src/clean-code/05-dry.ts
index 5698b2f8..9cd6f662 100644
--- a/src/clean-code/05-dry.ts
+++ b/src/clean-code/05-dry.ts
@@ -28,7 +28,7 @@ class Product {
     
     toString() {
         
-        if ( !this.isProductReady ) return;
+        if ( !this.isProductReady() ) return;
         
 
         return `${ this.name } (${ this.price }), ${ this.size }`